Commit 8c566ef5 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
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[PATCH] x86-64: Add command line option to set machine check tolerance level

Signed-off-by: default avatarAndi Kleen <>
Signed-off-by: default avatarLinus Torvalds <>
parent 673242c1
......@@ -11,6 +11,11 @@ Machine check
If your BIOS doesn't do that it's a good idea to enable though
to make sure you log even machine check events that result
in a reboot.
mce=tolerancelevel (number)
0: always panic, 1: panic if deadlock possible,
2: try to avoid panic, 3: never panic or exit (for testing)
default is 1
Can be also set using sysfs which is preferable.
nomce (for compatibility with i386): same as mce=off
......@@ -17,6 +17,7 @@
#include <linux/fs.h>
#include <linux/cpu.h>
#include <linux/percpu.h>
#include <linux/ctype.h>
#include <asm/processor.h>
#include <asm/msr.h>
#include <asm/mce.h>
......@@ -489,6 +490,7 @@ static int __init mcheck_disable(char *str)
/* mce=off disables machine check. Note you can reenable it later
using sysfs.
mce=TOLERANCELEVEL (number, see above)
mce=bootlog Log MCEs from before booting. Disabled by default to work
around buggy BIOS that leave bogus MCEs. */
static int __init mcheck_enable(char *str)
......@@ -499,6 +501,8 @@ static int __init mcheck_enable(char *str)
mce_dont_init = 1;
else if (!strcmp(str, "bootlog"))
mce_bootlog = 1;
else if (isdigit(str[0]))
get_option(&str, &tolerant);
printk("mce= argument %s ignored. Please use /sys", str);
return 0;
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